WO2010029965A1 - 感放射線性樹脂組成物 - Google Patents
感放射線性樹脂組成物 Download PDFInfo
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- WO2010029965A1 WO2010029965A1 PCT/JP2009/065819 JP2009065819W WO2010029965A1 WO 2010029965 A1 WO2010029965 A1 WO 2010029965A1 JP 2009065819 W JP2009065819 W JP 2009065819W WO 2010029965 A1 WO2010029965 A1 WO 2010029965A1
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- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
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- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
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- C08F220/1807—C7-(meth)acrylate, e.g. heptyl (meth)acrylate or benzyl (meth)acrylate
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
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- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/283—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing one or more carboxylic moiety in the chain, e.g. acetoacetoxyethyl(meth)acrylate
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
Definitions
- the present invention relates to a radiation-sensitive resin composition used in semiconductor manufacturing processes such as ICs, circuit boards such as liquid crystals and thermal heads, and other photolithography processes. More specifically, a chemically amplified radiation-sensitive resin composition that can be suitably used in a photolithography process using far ultraviolet rays having a wavelength of 250 nm or less or an electron beam as an exposure light source, such as KrF excimer laser and ArF excimer laser. It is about.
- the chemically amplified radiation-sensitive resin composition generates an acid in an exposed portion by irradiation with far ultraviolet rays or electron beams typified by a KrF excimer laser or an ArF excimer laser, and is exposed by a chemical reaction using this acid as a catalyst. It is a composition that causes a difference in the dissolution rate of the part and the unexposed part in the developer to form a resist pattern on the substrate.
- a KrF excimer laser (wavelength 248 nm) is used as a light source
- a polymer having a basic skeleton of poly (hydroxystyrene) (hereinafter sometimes referred to as “PHS”) that has low absorption in the 248 nm region.
- PHS poly(hydroxystyrene)
- a chemically amplified radiation-sensitive resin composition containing as a constituent is used. According to this composition, high sensitivity, high resolution, and good pattern formation can be realized.
- a lithography material using an ArF excimer laser as a light source a polymer having an alicyclic hydrocarbon having no large absorption in the 193 nm region in its skeleton, particularly a polymer having a lactone skeleton in its repeating unit is constituted.
- a resin composition as a component is used.
- a radiation sensitive resin composition comprising a polymer having a mevalonic lactone skeleton or a ⁇ -butyrolactone skeleton in its repeating unit is disclosed. (See Patent Documents 1 and 2). In addition, a resin composition containing a polymer having an alicyclic lactone skeleton in the repeating unit as a constituent component is also disclosed (see, for example, Patent Documents 3 to 13).
- JP-A-9-73173 US Pat. No. 6,388,101B JP 2000-159758 A JP 2001-109154 A JP 2004-101642 A JP 2003-113174 A Japanese Patent Laid-Open No. 2003-147023 JP 2002-308866 A JP 2002-371114 A JP 2003-64134 A Japanese Patent Laid-Open No. 2003-270787 JP 2000-26446 A JP 2000-122294 A
- the above-mentioned composition has a lactone skeleton in its repeating unit, so that the resolution performance as a resist is remarkably improved.
- the miniaturization of resist patterns has progressed to a level of 90 nm or less, not only high resolution performance but also other performance has been required.
- liquid immersion exposure is currently being put into practical use, and a resist material that can cope with this liquid immersion exposure is demanded.
- DOF Depth of Focus
- LWR Line Width Roughness
- MEEF Mask Error Enhancement Factor
- the present invention has been made in view of such problems of the prior art, and has a wide focal depth, a small LWR and MEEF, excellent pattern collapse characteristics, and excellent development defect performance.
- a composition is provided.
- the present inventors have found that a polymer comprising a polymer having a repeating unit containing a cyclic carbonate structure and an acid diffusion having a carbamate structure. It has been found that the above problems can be solved by using an inhibitor or the like as a constituent of the radiation-sensitive resin composition, and the present invention has been completed. Specifically, the present invention provides the following radiation-sensitive resin composition.
- R 1 independently of each other represents a hydrogen atom, a methyl group or a trifluoromethyl group
- R is a monovalent group represented by general formula (a ′)
- R 19 independently of each other represents a hydrogen atom or a chain hydrocarbon group having 1 to 5 carbon atoms
- A represents a single bond
- a carbon number represents a divalent alicyclic hydrocarbon group having 3 to 30 or a divalent aromatic hydrocarbon group having 6 to 30 carbon atoms
- the carbonate ester ring of the general formula (a ′) has a second bond bonded to A, and the first bond and the first bond A ring structure containing two bonds may be formed.
- R 2 and R 3 are each independently a hydrogen atom, a monovalent chain hydrocarbon group having 1 to 20 carbon atoms, or a carbon number of 3 to 20 A monovalent alicyclic hydrocarbon group or a monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms is shown. Two R 2 may be bonded to form a ring structure.
- a second carbon atom different from the first carbon atom having the first bond of the carbonate ring has the second bond
- the repeating unit in which a condensed ring having a carbon atom and the second carbon atom as a constituent atom is formed, and the first carbon atom having the first bond of the carbonate ring also has the second bond.
- R 1 independently of each other represents a hydrogen atom, a methyl group or a trifluoromethyl group
- R is a monovalent group represented by general formula (a ′)
- R 19 independently of each other represents a hydrogen atom or a chain hydrocarbon group having 1 to 5 carbon atoms
- A represents a single bond, a divalent chain hydrocarbon group having 1 to 30 carbon atoms, a carbon number Represents a divalent alicyclic hydrocarbon group having 3 to 30 or a divalent aromatic hydrocarbon group having 6 to 30 carbon atoms
- the carbonate ester ring of the general formula (a ′) has a second bond bonded to A, and the first bond and the first bond A ring structure containing two bonds may be formed.
- R 1 independently represents a hydrogen atom, a methyl group or a trifluoromethyl group
- R 17 represents an alkyl group having 1 to 10 carbon atoms
- R 18 represents an alkyl group having 2 to 4 carbon atoms.
- a represents a number from 1 to 6;
- the radiation-sensitive resin composition of the present invention has a wide depth of focus, a small LWR and MEEF, excellent pattern collapse characteristics, and excellent development defect performance. Therefore, it can be suitably used as a lithography material using an ArF excimer laser as a light source. Moreover, it can respond also to the lithography material which uses immersion exposure and a KrF excimer laser as a light source.
- 3 is an analysis chart by 13 C-NMR of a polymer (A-5) which is a constituent component of the radiation-sensitive resin composition of the present invention.
- 3 is a 13 C-NMR analysis chart of a polymer (A-7) which is a constituent component of the radiation-sensitive resin composition of the present invention.
- the present invention includes all embodiments including the invention-specific matters, and is not limited to the embodiments described below.
- the same type of substituent is given the same reference numeral, and the description is omitted.
- ... group means “optionally substituted ... group”.
- alkyl group when “alkyl group” is described, it includes not only an unsubstituted alkyl group but also an alkyl group in which a hydrogen atom is substituted with another functional group.
- ... Group means “a group that may have a branch ...”.
- alkylcarbonyl group includes not only a linear alkylcarbonyl group but also a branched alkylcarbonyl group.
- the radiation sensitive resin composition of the present invention comprises a polymer (A), an acid generator (B), and an acid diffusion inhibitor (C) as essential components, and depending on the purpose, a solvent (D), an additive (E ).
- A polymer
- B acid generator
- C acid diffusion inhibitor
- D solvent
- E additive
- Polymer (A) The polymer (A) in the present invention is a polymer having the repeating unit (a-1) represented by the general formula (a-1).
- Repeating unit (a-1) is a group having a cyclic carbonate structure represented by the general formula (a-1) (a group represented by the general formula (a ′) (hereinafter referred to as “group (a ′)”). )) And is an essential repeating unit of the polymer (A).
- Examples thereof include repeating units (a-1a) to (a-1v) represented by the following general formulas (a-1a) to (a-1v).
- R 1 s independently denote a hydrogen atom, a methyl group, or a trifluoromethyl group. Of these, a methyl group is preferred.
- R is a monovalent group represented by the general formula (a ′), and R 19 independently represents a hydrogen atom or a chain hydrocarbon group having 1 to 5 carbon atoms.
- chain hydrocarbon group having 1 to 5 carbon atoms include linear alkyl groups having 1 to 5 carbon atoms such as methyl group, ethyl group, propyl group and butyl group; isopropyl group, isobutyl group, t A branched alkyl group having 3 to 5 carbon atoms such as a butyl group.
- m and n are integers of 0 to 3
- repeating unit a-1a is a 5-membered ring structure
- a-1j is a 6-membered ring structure
- a-1h is a 7-membered ring structure.
- A represents a single bond, a divalent chain hydrocarbon group having 1 to 30 carbon atoms, a divalent alicyclic hydrocarbon group having 3 to 30 carbon atoms, or carbon.
- a divalent aromatic hydrocarbon group having a number of 6 to 30 is shown.
- chain hydrocarbon group refers to a hydrocarbon group that includes only a chain structure without including a cyclic structure in the main chain.
- examples of the “divalent chain hydrocarbon group having 1 to 30 carbon atoms” include, for example, a methylene group, an ethylene group, a 1,2-propylene group, a 1,3-propylene group, a tetramethylene group, and a pentamethylene group.
- alicyclic hydrocarbon group means a hydrocarbon group containing only an alicyclic hydrocarbon structure and no aromatic ring structure as the ring structure. However, it is not necessary to be constituted only by the structure of the alicyclic hydrocarbon, and a part thereof may include a chain structure.
- Examples of the “divalent alicyclic hydrocarbon group” include 1,3-cyclobutylene group, 1,3-cyclopentylene group, 1,4-cyclohexylene group, 1,5-cyclooctylene group, etc.
- a monocyclic cycloalkylene group having 3 to 10 carbon atoms such as 1,4-norbornylene group, 2,5-norbornylene group, 1,5-adamantylene group, 2,6-adamantylene group, etc.
- aromatic hydrocarbon group means a hydrocarbon group containing an aromatic ring structure as a ring structure. However, it is not necessary to be composed only of an aromatic ring structure, and a part thereof may include a chain structure or an alicyclic hydrocarbon structure.
- divalent aromatic hydrocarbon group examples include arylene groups such as a phenylene group, a tolylene group, a naphthylene group, a phenanthrylene group, and an anthrylene group.
- the oxygen atom of (meth) acrylic acid constituting the polymer and the carbon atom constituting the structure (a ′) are linear chains having 1 to 5 carbon atoms.
- a structure bonded through a linear alkyl group (repeating units a-1a to a-1f).
- a cyclic structure may be included as a substituent of A (a-1p).
- the carbonate ester ring of the general formula (a ′) has a second bond bonded to A, and the first bond and the first bond A ring structure containing two bonds may be formed.
- the polymer (A) has a second carbon atom different from the first carbon atom having the first bond of the carbonate ring.
- the carbonate ring and A may be integrated to form a condensed ring or a spiro ring.
- the repeating units a-1g, a-1k, a-1l, a-1q, a-1t, a-1u, a-1i, a-1r, a-1s, a-1v formed the condensed ring. It is an example of a repeating unit.
- a-1j and a-1n are examples of at least one repeating unit among the repeating units in which the spiro ring is formed.
- the condensed ring or the spiro ring may be a hetero ring (a-1q to a-1v).
- A is an alicyclic hydrocarbon group
- the oxygen atom of (meth) acrylic acid constituting the polymer and the carbon atom constituting the cyclic carbonate are bonded via a norbornylene group.
- the repeating units a-1k and a-1l are examples in which a condensed ring containing the carbon atom contained in A and the two carbon atoms constituting the cyclic carbonate is formed.
- A is an aromatic hydrocarbon group
- an oxygen atom of (meth) acrylic acid constituting a polymer and a carbon atom constituting a cyclic carbonate are bonded via a benzylene group (repeatedly) And the unit a-1o).
- a second carbon atom different from the first carbon atom having the first bond of the carbonate ring has the second bond, and the first carbon atom and the carbon atom
- a condensed ring having a second carbon atom as a constituent atom is formed.
- the monomer may be, for example, Tetrahedron Letters, Vol. 27, no. 32 p. 3741 (1986), Organic Letters, Vol. 4, no. 15 p. 2561 (2002) and the like, and can be synthesized by a conventionally known method.
- one of the exemplified repeating units (a-1) may be contained alone, or two or more thereof may be contained.
- the content of the repeating unit (a-1) is preferably 5 to 80 mol% with respect to all repeating units constituting the polymer (A), and preferably 10 to 70 mol%. More preferred is 10 to 50 mol%.
- the developability as a resist, low defect property, low LWR, low PEB temperature dependence, etc. can be improved.
- the content of a-1 is less than 5 mol%, the developability and low defectivity as a resist may be lowered.
- it exceeds 80 mol% there exists a possibility that the resolution as a resist, low LWR, and low PEB temperature dependence may fall.
- low defectivity means that defects are hardly generated in the photolithography process.
- the “defect” in the photolithography process include a watermark defect, a blob defect, a bubble defect, and the like. If a large number of these defects occur in device manufacturing, the device yield is greatly affected, which is not preferable.
- the “watermark defect” is a defect in which a droplet trace of the immersion liquid remains on the resist pattern
- the “blob defect” is a polymer once dissolved in the developer deposited by a shock of rinsing, A defect reattached to the substrate, and a “bubble defect” is a defect in which a desired pattern cannot be obtained due to a change in optical path due to the immersion liquid containing bubbles during immersion exposure.
- Repeating unit (a-2) The polymer (A) preferably contains a polymer having a repeating unit (a-2) containing a lactone structure in addition to the repeating unit (a-1).
- repeating unit (a-2) examples include repeating units (a-2a) to (a-2p) represented by the following general formulas (a-2a) to (a-2p).
- R 1 each independently represents a hydrogen atom, a methyl group or a trifluoromethyl group.
- the repeating unit (a-2) is preferably a repeating unit containing a lactone ring condensed with an alicyclic hydrocarbon group.
- the repeating unit a-2f is an example of a repeating unit containing a lactone ring condensed with a cyclohexane ring.
- the repeating unit (a-2) is particularly preferably a repeating unit containing a lactone ring condensed with a polycyclic alicyclic hydrocarbon group.
- the repeating units a-2a, a-2c, a-2g to a-2o are examples of repeating units containing a lactone ring condensed with a norbornene ring, and a-2d is a bicyclo [2.2.2] octane. It is an example of the repeating unit containing the lactone ring condensed to the ring.
- Monomers that give the repeating unit (a-2) include (meth) acrylic acid-5-oxo-4-oxa-tricyclo [4.2.1.0 3,7 ] non-2-yl ester, (Meth) acrylic acid-9-methoxycarbonyl-5-oxo-4-oxa-tricyclo [4.2.1.0 3,7 ] non-2-yl ester, (meth) acrylic acid-5-oxo-4- Oxa-tricyclo [5.2.1.0 3,8 ] dec-2-yl ester, (meth) acrylic acid-10-methoxycarbonyl-5-oxo-4-oxa-tricyclo [5.2.1.0 3,8 ] non-2-yl ester, (meth) acrylic acid-6-oxo-7-oxa-bicyclo [3.2.1] oct-2-yl ester, (meth) acrylic acid-4-methoxycarbonyl -6-oxo-7-oki -Bicyclo [3.2.1] oct-2-yl ester, (
- one of the exemplified repeating units (a-2) may be contained alone, or two or more thereof may be contained.
- the content of the repeating unit (a-2) is preferably 0 to 90 mol%, preferably 0 to 80 mol%, based on all repeating units constituting the polymer (A). More preferred is 0 to 70 mol%. If the content of the repeating unit (a-2) exceeds 90 mol%, the resolution as a resist, LWR, and PEB temperature dependence may be reduced.
- the polymer (A) is preferably a polymer having a repeating unit (a-3) represented by the following general formula (a-3) in addition to the repeating unit (a-1).
- R 1 independently represents a hydrogen atom, a methyl group or a trifluoromethyl group
- R 4 represents an alkyl group having 1 to 20 carbon atoms or a carbon group having 3 to 20 carbon atoms. It represents an alicyclic hydrocarbon group, or two R 4 s combine to form an alicyclic structure having 3 to 20 carbon atoms, and the remaining R 4 represents an alkyl group having 1 to 10 carbon atoms.
- R 1 independently represents a hydrogen atom, a methyl group or a trifluoromethyl group
- R 4 represents an alkyl group having 1 to 20 carbon atoms or a carbon group having 3 to 20 carbon atoms. It represents an alicyclic hydrocarbon group, or two R 4 s combine to form an alicyclic structure having 3 to 20 carbon atoms, and the remaining R
- the “alkyl group having 1 to 20 carbon atoms” represented by R 4 includes a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n-hexyl group, and a lauryl group.
- Linear alkyl groups such as stearyl groups; branched alkyl groups such as i-propyl groups, 2-methylpropyl groups, 1-methylpropyl groups, isobutyl groups, t-butyl groups, isoamyl groups, 2-ethylhexyl groups; Etc.
- examples of the “alicyclic hydrocarbon group having 3 to 20 carbon atoms” include cycloalkyl groups such as a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclooctyl group, and a cyclododecyl group; bicyclo [2.2.1] heptyl group, bicyclo [2.2.2] octyl, bicyclo [4.4.0] decyl, tricyclo [5.2.1.0 2, 6] decyl group, tetracyclo [6.2.1.1 3 , 6 .
- a polycyclic alicyclic hydrocarbon group such as 0 2,7 ] dodecyl group and tricyclo [3.3.1.1 3,7 ] decyl group (adamantyl group).
- Examples of two R 4 are both bonded is formed together with the carbon atom bonded "alicyclic structure", an alicyclic structure constituting an alicyclic hydrocarbon group described above, for example, cycloalkane Examples include a structure and a polycyclic alicyclic structure.
- the polymer (A) comprises repeating units (a-3a) represented by the general formula (a-3a) and repeating units represented by the general formula (a-3b). It is preferable to have at least one type of repeating unit.
- repeating units represented by the following general formulas (a-3a1) to (a-3a9) are particularly preferable.
- repeating unit (a-3b) a repeating unit represented by general formula (a-3b1) or (a-3b2) shown below is particularly preferable.
- Monomers that give the repeating unit (a-3b) include (meth) acrylic acid 2-ethyladamantyl-2-yl ester, (meth) acrylic acid 2-ethyl-3-hydroxyadamantyl-2-yl ester, (Meth) acrylic acid 2-n-propyladamantyl-2-yl ester, (meth) acrylic acid 2-isopropyladamantyl-2-yl ester and the like are preferable, and (meth) acrylic acid 2-ethyladamantyl-2-yl ester is more preferable. preferable.
- the polymer of the present invention includes a repeating unit (a-1) represented by the general formula (a-1), a repeating unit (a-3a) represented by the general formula (a-3a), and the general formula ( and at least one repeating unit of repeating units (a-3b) represented by a-3b).
- a polymer having the repeating unit (a-1) and the repeating unit (a-3a) is preferable.
- one of the exemplified repeating units (a-3a) and (a-3b) may be contained alone, or two or more thereof may be contained.
- the content of the repeating units (a-3a) and (a-3b) is preferably 5 to 80 mol% with respect to all the repeating units constituting the polymer (A). It is more preferably from 10 to 80 mol%, particularly preferably from 20 to 70%.
- the content of the repeating unit (a-3) exceeds 80 mol%, the adhesiveness of the resist film is lowered, and pattern collapse or pattern peeling may occur.
- Examples of the other repeating unit (a-3) include repeating units represented by the following general formulas (a-3c) to (a-3i).
- the polymer (A) may contain an alkyl group having one or more polar groups or an alicyclic hydrocarbon group as other repeating units.
- the radiation-sensitive resin composition containing such a polymer promotes the solubility of the exposed portion of the resist in an alkali developer (alkaline aqueous solution).
- the polar group examples include groups that are more polar than hydrocarbon groups, such as a hydroxyl group, a carbonyl group, a cyano group, an alkyl ester group, and an aromatic ester group.
- the polar group has a hydroxyl group (preferably a secondary or tertiary hydroxyl group) from the viewpoint of further reducing the undissolved residue during development with an alkaline developer and further reducing the incidence of development defects. It is preferably a group or a group having a carbonyl group.
- repeating unit represented by the following general formula is mentioned.
- the polymer (A) can further contain other repeating units, for example, other repeating units derived from (meth) acrylic acid esters.
- the polymer (A) can be synthesized according to a conventional method such as radical polymerization. For example, (1) a method in which a solution containing a monomer and a radical initiator is dropped into a reaction solvent or a solution containing a monomer to cause a polymerization reaction; (2) a solution containing the monomer and a radical A method in which a solution containing an initiator is dropped into a reaction solvent or a solution containing a monomer separately to cause a polymerization reaction; (3) a plurality of types of solutions containing each monomer, and radical initiation It is preferable to synthesize
- a conventional method such as radical polymerization.
- the amount of the monomer in the dropped monomer solution is 30 mol% with respect to the total amount of monomers used for polymerization.
- it is more preferably 50 mol% or more, and particularly preferably 70 mol% or more.
- the reaction temperature in these methods may be appropriately determined depending on the initiator type. Usually, it is 30 to 180 ° C, preferably 40 to 160 ° C, and more preferably 50 to 140 ° C.
- the dropping time varies depending on the reaction temperature, the type of initiator, the monomer to be reacted, etc., but is usually 30 minutes to 8 hours, preferably 45 minutes to 6 hours, and more preferably 1 to 5 hours. Further, the total reaction time including the dropping time varies depending on the conditions as in the dropping time, but is usually 30 minutes to 8 hours, preferably 45 minutes to 7 hours, and more preferably 1 to 6 hours.
- radical initiator used in the polymerization examples include 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2′-azobis (2-cyclopropylpropionitrile), 2, 2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane- 1-carbonitrile), 2,2′-azobis (2-methyl-N-phenylpropionamidine) dihydrochloride, 2,2′-azobis (2-methyl-N-2-propenylpropionamidine) dihydrochloride, 2, 2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis ⁇ 2-methyl- -[1,1-bis (hydroxymethyl) 2-hydroxyethyl] propionamide ⁇ , dimethyl-2,2′-azobis (2-methylpropionat
- any solvent other than a solvent that inhibits polymerization (nitrobenzene having a polymerization inhibiting effect, mercapto compound having a chain transfer effect, etc.) and capable of dissolving the monomer may be used. It can. Examples thereof include alcohols, ethers, ketones, amides, esters / lactones, nitriles, and mixed solvents thereof.
- Examples of the “alcohols” include methanol, ethanol, propanol, isopropanol, butanol, ethylene glycol, propylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, 1-methoxy-2-propanol and the like.
- Examples of the “ethers” include propyl ether, isopropyl ether, butyl methyl ether, tetrahydrofuran, 1,4-dioxane, 1,3-dioxolane, 1,3-dioxane and the like.
- ketones include acetone, methyl ethyl ketone, diethyl ketone, methyl isopropyl ketone, and methyl isobutyl ketone.
- amides include N, N-dimethylformamide, N, N-dimethylacetamide and the like.
- ester / lactone examples include ethyl acetate, methyl acetate, isobutyl acetate, ⁇ -butyrolactone, and the like.
- nitriles include acetonitrile, propionitrile, butyronitrile and the like. These solvents can be used alone or in admixture of two or more.
- the polymer obtained by the polymerization reaction is preferably recovered by a reprecipitation method. That is, after completion of the polymerization reaction, the polymer is recovered as a powder by introducing the polymerization solution into a reprecipitation solvent.
- a reprecipitation solvent the solvent illustrated as the said polymerization solvent can be used individually or in mixture of 2 or more types.
- the polymer (A) contains a low molecular weight component derived from a monomer, the content thereof is 0.1% by mass or less with respect to the total amount (100% by mass) of the polymer (A). It is preferable that it is 0.07 mass% or less, and it is especially preferable that it is 0.05 mass% or less.
- this low molecular weight component When the content of this low molecular weight component is 0.1% by mass or less, a resist film is prepared using this polymer (A), and the water in contact with the resist film is subjected to immersion exposure. It is possible to reduce the amount of eluate in Furthermore, no foreign matter is deposited in the resist during resist storage, and coating unevenness does not occur during resist application. Therefore, it is possible to sufficiently suppress the occurrence of defects when forming a resist pattern.
- the polystyrene-equivalent weight average molecular weight (hereinafter sometimes referred to as “Mw”) by gel permeation chromatography (GPC) is Mw500. It shall mean the following ingredients. Specifically, it is a component such as a monomer, dimer, trimer or oligomer.
- This “low molecular weight component” can be removed by, for example, chemical purification methods such as washing with water, liquid-liquid extraction, and the like, and chemical purification methods combined with physical purification methods such as ultrafiltration and centrifugation. it can.
- this low molecular weight component can be quantified by analyzing the polymer (A) by high performance liquid chromatography (HPLC).
- HPLC high performance liquid chromatography
- the polymer (A) is preferably as low as possible impurities such as halogen and metal, thereby further improving the sensitivity, resolution, process stability, pattern shape, etc. when used as a resist. Can do.
- the polystyrene-equivalent weight average molecular weight (hereinafter referred to as “Mw”) of the polymer (A) by gel permeation chromatography (GPC) is not particularly limited, but is preferably 1,000 to 100,000. 1,000 to 30,000 is more preferable, and 1,000 to 20,000 is particularly preferable.
- Mw of the polymer (A) is less than 1,000, the heat resistance when used as a resist tends to decrease.
- the Mw of the polymer (A) exceeds 100,000, the developability when used as a resist tends to be lowered.
- the ratio (Mw / Mn) of Mw to the number average molecular weight in terms of polystyrene (hereinafter referred to as “Mn”) by gel permeation chromatography (GPC) of the polymer (A) is usually 1.0 to 5. 0, preferably 1.0 to 3.0, and more preferably 1.0 to 2.0.
- the polymer (A) can be used alone or in admixture of two or more.
- Acid generator (B) is a radiation-sensitive acid generator that generates an acid upon exposure. This acid generator dissociates an acid-dissociable group present in the polymer (A) contained in the radiation-sensitive resin composition by an acid generated by exposure (releases a protecting group), The polymer (A) is alkali-soluble. As a result, the exposed portion of the resist film becomes readily soluble in an alkaline developer, thereby forming a positive resist pattern.
- R 12 represents a hydrogen atom, a fluorine atom, a hydroxyl group, an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, or an alkoxycarbonyl group having 2 to 11 carbon atoms
- R 13 represents an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, or an alkanesulfonyl group having 1 to 10 carbon atoms
- R 14 is independently an alkyl group having 1 to 10 carbon atoms
- a phenyl group and a naphthyl group are shown.
- R 14s may be bonded to each other to form a divalent group having 2 to 10 carbon atoms.
- k represents an integer of 0 to 2
- r represents an integer of 0 to 10
- X ⁇ represents an anion represented by the following general formulas (b-1) to (b-4).
- R 15 represents a hydrogen atom, a fluorine atom, or a hydrocarbon group having 1 to 12 carbon atoms, and y represents an integer of 1 to 10)
- R 16 independently represents a fluorine-substituted alkyl group having 1 to 10 carbon atoms, provided that two R 16 are bonded to each other.
- a divalent fluorine-substituted alkylene group having 2 to 10 carbon atoms may be formed.
- examples of the “alkyl group having 1 to 10 carbon atoms” represented by R 12 , R 13 and R 14 include n already mentioned “alkyl group having 1 to 4 carbon atoms” and n A linear alkyl group such as a pentyl group, an n-hexyl group, an n-heptyl group, an n-octyl group, an n-nonyl group or an n-decyl group; a branched alkyl group such as a neopentyl group or a 2-ethylhexyl group; Etc. Of these, methyl, ethyl, n-butyl, t-butyl and the like are preferable.
- alkoxyl group having 1 to 10 carbon atoms represented by R 12 and R 13 includes a methoxy group, an ethoxy group, an n-propoxy group, an n-butoxy group, an n-pentyloxy group, and an n-hexyloxy group.
- Linear alkoxyl groups such as n-heptyloxy group, n-octyloxy group, n-nonyloxy group, n-decyloxy group; i-propoxy group, 2-methylpropoxy group, 1-methylpropoxy group, t-butoxy Groups, branched alkoxyl groups such as neopentyloxy group, 2-ethylhexyloxy group, and the like.
- methoxy, ethoxy, n-propoxy, n-butoxy and the like are preferable.
- the “alkoxycarbonyl group having 2 to 11 carbon atoms” represented by R 12 includes a methoxycarbonyl group, an ethoxycarbonyl group, an n-propoxycarbonyl group, an n-butoxycarbonyl group, an n-pentyloxycarbonyl group, an n- Linear alkoxycarbonyl groups such as hexyloxycarbonyl group, n-heptyloxycarbonyl group, n-octyloxycarbonyl group, n-nonyloxycarbonyl group, n-decyloxycarbonyl group; i-propoxycarbonyl group, 2-methyl And branched alkoxycarbonyl groups such as propoxycarbonyl group, 1-methylpropoxycarbonyl group, t-butoxycarbonyl group, neopentyloxycarbonyl group, 2-ethylhexyloxycarbonyl group, and the like. Of these, a methoxycarbonyl group,
- Examples of the “alkanesulfonyl group having 1 to 10 carbon atoms” represented by R 13 include a methanesulfonyl group, an ethanesulfonyl group, an n-propanesulfonyl group, an n-butanesulfonyl group, an n-pentanesulfonyl group, n A linear alkanesulfonyl group such as hexanesulfonyl group, n-heptanesulfonyl group, n-octanesulfonyl group, n-nonanesulfonyl group, n-decanesulfonyl group; tert-butanesulfonyl group, neopentanesulfonyl group, 2- And branched alkanesulfonyl groups such as ethylhexanesulfonyl group; cycloalkanesulfony
- a methanesulfonyl group an ethanesulfonyl group, an n-propanesulfonyl group, an n-butanesulfonyl group, a cyclopentanesulfonyl group, a cyclohexanesulfonyl group, and the like are preferable.
- r is preferably an integer of 0 to 2.
- the “alkoxyl group” includes a linear alkoxyl group such as a methoxy group, an ethoxy group, an n-propoxy group, and an n-butoxy group; i-propoxy group And branched alkoxyl groups such as 2-methylpropoxy group, 1-methylpropoxy group and t-butoxy group; cycloalkyloxy groups such as cyclopentyloxy group and cyclohexyloxy group. These groups preferably have 1 to 20 carbon atoms.
- alkoxyalkyl group examples include linear alkoxyalkyl groups such as methoxymethyl group, ethoxymethyl group, 2-methoxyethyl group and 2-ethoxyethyl group; branched groups such as 1-methoxyethyl group and 1-ethoxyethyl group An alkoxyalkyl group having a cycloalkane structure; and the like. These groups preferably have 1 to 20 carbon atoms.
- alkoxycarbonyl group examples include linear alkoxycarbonyl groups such as methoxycarbonyl group, ethoxycarbonyl group, n-propoxycarbonyl group, n-butoxycarbonyl group; i-propoxycarbonyl group, 2-methylpropoxycarbonyl group, 1 -Branched alkoxycarbonyl groups such as methylpropoxycarbonyl group and t-butoxycarbonyl group; cycloalkyloxycarbonyl groups such as cyclopentyloxycarbonyl group and cyclohexyloxycarbonyl; and the like. These groups preferably have 2 to 21 carbon atoms.
- alkoxycarbonyloxy group examples include linear alkoxycarbonyloxy groups such as methoxycarbonyloxy group, ethoxycarbonyloxy group, n-propoxycarbonyloxy group, n-butoxycarbonyloxy group; i-propoxycarbonyloxy group, t A branched alkoxycarbonyloxy group such as a butoxycarbonyloxy group; a cycloalkyloxycarbonyl group such as a cyclopentyloxycarbonyl group and cyclohexyloxycarbonyl; These groups preferably have 2 to 21 carbon atoms.
- phenyl group represented by R 14
- a phenyl group, 4-cyclohexylphenyl group, 4-t-butylphenyl group, 4-methoxyphenyl group, 4-t-butoxyphenyl group and the like are preferable.
- the “naphthyl group” represented by R 14 includes, for example, 1-naphthyl group; 2-methyl-1-naphthyl group, 3-methyl-1-naphthyl group, 4-methyl-1-naphthyl group, 4-methyl-1-naphthyl group, 5-methyl-1-naphthyl group, 6-methyl-1-naphthyl group, 7-methyl-1-naphthyl group, 8-methyl-1-naphthyl group, 2,3-dimethyl -1-naphthyl group, 2,4-dimethyl-1-naphthyl group, 2,5-dimethyl-1-naphthyl group, 2,6-dimethyl-1-naphthyl group, 2,7-dimethyl-1-naphthyl group, 2,8-dimethyl-1-naphthyl group, 3,4-dimethyl-1-naphthyl
- alkoxyl group examples include the groups exemplified in the section of the phenyl group Can do.
- Examples of the “naphthyl group” represented by R 14 include 1-naphthyl group, 1- (4-methoxynaphthyl) group, 1- (4-ethoxynaphthyl) group, 1- (4-n-propoxynaphthyl) group, 1 -(4-n-butoxynaphthyl) group, 2- (7-methoxynaphthyl) group, 2- (7-ethoxynaphthyl) group, 2- (7-n-propoxynaphthyl) group, 2- (7-n- Butoxynaphthyl) group and the like are preferable.
- This “divalent group” has at least one hydrogen atom selected from the group consisting of hydroxyl group, carboxyl group, cyano group, nitro group, alkoxyl group, alkoxyalkyl group, alkoxycarbonyl group and alkoxycarbonyloxy group. It may be substituted with a group. A part of hydrogen atoms may be substituted. Examples of the “alkoxyl group”, “alkoxyalkyl group”, “alkoxycarbonyl group”, and “alkoxycarbonyloxy group” include the groups exemplified in the section of the phenyl group.
- R 14 a methyl group, an ethyl group, a phenyl group, a 4-methoxyphenyl group, a 1-naphthyl group, two R 14s are bonded to each other, and together with the sulfur atom in the general formula (B-1), tetrahydrothiophene A structure in which a ring is formed is preferable.
- Examples of the cation of the general formula (B-1) include triphenylsulfonium cation, tri-1-naphthylsulfonium cation, tri-tert-butylphenylsulfonium cation, 4-fluorophenyl-diphenylsulfonium cation, di-4-fluorophenyl- Phenylsulfonium cation, tri-4-fluorophenylsulfonium cation, 4-cyclohexylphenyl-diphenylsulfonium cation, 4-methanesulfonylphenyl-diphenylsulfonium cation, 4-cyclohexanesulfonyl-diphenylsulfonium cation, 1-naphthyldimethylsulfonium cation, 1- Naphthyl diethylsulfonium cation, 1- (4-hydroxynaph
- —C y F 2y — is a perfluoroalkylene group having a carbon number y and may be linear or branched. And y is preferably 1, 2, 4 or 8.
- the “hydrocarbon group having 1 to 12 carbon atoms” represented by R 15 includes an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group, A cyclic hydrocarbon group is preferred.
- the “fluorine-substituted alkyl group having 1 to 10 carbon atoms” represented by R 16 includes a trifluoromethyl group, a pentafluoroethyl group, a heptafluoropropyl group, Nonafluorobutyl group, dodecafluoropentyl group, perfluorooctyl group and the like can be mentioned.
- Examples of the “divalent fluorine-substituted alkylene group having 2 to 10 carbon atoms” formed by bonding two R 16 to each other include a tetrafluoroethylene group, a hexafluoropropylene group, an octafluorobutylene group, a decafluoropentylene group. Examples include a len group and an undecafluorohexylene group.
- anion moiety of the general formula (B-1) examples include trifluoromethanesulfonate anion, perfluoro-n-butanesulfonate anion, perfluoro-n-octanesulfonate anion, 2- (bicyclo [2.2.1] hepta-2 -Yl) -1,1,2,2-tetrafluoroethanesulfonate anion, 2- (bicyclo [2.2.1] hept-2-yl) -1,1-difluoroethanesulfonate anion, 1-adamantylsulfonate anion
- anions represented by the following formulas (b-3a) to (b-3g) are preferable.
- the acid generator (B) is composed of combinations of cations and anions already exemplified. However, the combination is not particularly limited. In the resin composition of this invention, an acid generator (B) may be used individually by 1 type, and 2 or more types may be mixed and used for it.
- acid generators other than an acid generator (B).
- acid generators include onium salt compounds, halogen-containing compounds, diazoketone compounds, sulfone compounds, and sulfonic acid compounds. Specifically, the following can be mentioned.
- Examples of the “onium salt compound” include iodonium salts, sulfonium salts, phosphonium salts, diazonium salts, pyridinium salts, and the like. More specifically, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium nonafluoro-n-butanesulfonate, diphenyliodonium perfluoro-n-octanesulfonate, diphenyliodonium 2-bicyclo [2.2.1] hept-2-yl- 1,1,2,2-tetrafluoroethanesulfonate, bis (4-t-butylphenyl) iodonium trifluoromethanesulfonate, bis (4-t-butylphenyl) iodonium nonafluoro-n-butanesulfonate, bis (4-t -Butylphenyl) iodonium perfluoro-n
- halogen-containing compound examples include haloalkyl group-containing hydrocarbon compounds, haloalkyl group-containing heterocyclic compounds, and the like. More specifically, (trichloromethyl) -s such as phenylbis (trichloromethyl) -s-triazine, 4-methoxyphenylbis (trichloromethyl) -s-triazine, 1-naphthylbis (trichloromethyl) -s-triazine, etc. -Triazine derivatives; 1,1-bis (4-chlorophenyl) -2,2,2-trichloroethane; and the like.
- diazoketone compounds include 1,3-diketo-2-diazo compounds, diazobenzoquinone compounds, diazonaphthoquinone compounds, and the like. More specifically, 1,2-naphthoquinonediazide of 1,2-naphthoquinonediazide-4-sulfonyl chloride, 1,2-naphthoquinonediazide-5-sulfonylchloride, 2,3,4,4′-tetrahydroxybenzophenone 4-sulfonic acid ester, 1,2-naphthoquinonediazide-5-sulfonic acid ester, 1,1,1-naphthoquinonediazide-4-sulfonic acid ester of 1,1,1-tris (4-hydroxyphenyl) ethane, 1,2, -Naphthoquinonediazide-5-sulfonic acid ester and the like.
- sulfone compound examples include ⁇ -ketosulfone, ⁇ -sulfonylsulfone, ⁇ -diazo compounds of these compounds, and the like. More specifically, 4-trisphenacyl sulfone, mesityl phenacyl sulfone, bis (phenylsulfonyl) methane and the like can be mentioned.
- sulfonic acid compound examples include alkyl sulfonic acid esters, alkyl sulfonic acid imides, haloalkyl sulfonic acid esters, aryl sulfonic acid esters, imino sulfonates, and the like.
- the total amount of the acid generator (B) and the other acid generator used is based on 100 parts by mass of the polymer (A) from the viewpoint of ensuring sensitivity and developability as a resist.
- it is 0.1 to 30 parts by mass, and preferably 0.5 to 20 parts by mass.
- the usage-amount of another acid generator is 80 mass% or less with respect to the total amount of an acid generator (B) and another acid generator, and it is further 60 mass% or less. preferable.
- Acid diffusion inhibitor (C) The radiation sensitive resin composition of the present invention further contains an acid diffusion inhibitor (C) in addition to the polymer (A) and the acid generator (B) described so far.
- This acid diffusion inhibitor (C) controls the diffusion phenomenon in the resist film of the acid generated from the acid generator upon exposure, and suppresses an undesirable chemical reaction in the non-exposed region.
- the storage stability of the resulting radiation-sensitive resin composition is improved, the resolution as a resist is further improved, and the heat treatment from exposure to exposure is performed.
- the change in the line width of the resist pattern due to the fluctuation of the holding time (PED) up to the above can be suppressed, and a composition having excellent process stability can be obtained.
- Base (C-1) is a base represented by the following general formula (C-1).
- R 2 and R 3 are each independently a hydrogen atom, a monovalent chain hydrocarbon group having 1 to 20 carbon atoms, or a carbon number of 3 to 20 A monovalent alicyclic hydrocarbon group or a monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms is shown. Two R 2 may be bonded to form a ring structure.
- the group represented by R 3 is preferably a tert-butyl group or a tert-amyl group.
- two R 2 may be bonded to form a ring structure.
- nitrogen compound (C-1) for example, Nt-butoxycarbonylpyrrolidine, Nt-butoxycarbonyl-2-phenyl) Benzimidazole.
- Examples of the nitrogen-containing compound represented by the general formula (C-1) include Nt-butoxycarbonyldi-n-octylamine, Nt-butoxycarbonyldi-n-nonylamine, and Nt-butoxy. Carbonyl di-n-decylamine, Nt-butoxycarbonyldicyclohexylamine, Nt-butoxycarbonyl-1-adamantylamine, Nt-butoxycarbonyl-2-adamantylamine, Nt-butoxycarbonyl-N-methyl -1-adamantylamine, (S)-( ⁇ )-1- (t-butoxycarbonyl) -2-pyrrolidinemethanol, (R)-(+)-1- (t-butoxycarbonyl) -2-pyrrolidinemethanol, Nt-butoxycarbonyl-4-hydroxypiperidine, Nt-butoxycarbonylpyrrolidine N, N′-di-t-butoxycarbonylpiperazine, N, N-di
- Nt-amyloxycarbonyldi-n-octylamine Nt-amyloxycarbonyldi-n-nonylamine, Nt-amyloxycarbonyldi-n-decylamine, Nt-amyloxycarbonyldicyclohexylamine, Nt-amyloxycarbonyl-1-adamantylamine, Nt-amyloxycarbonyl-2-adamantylamine, Nt-amyloxycarbonyl-N-methyl-1-adamantylamine, (S)-( ⁇ ) -1- (t-amyloxycarbonyl) -2-pyrrolidinemethanol, (R)-(+)-1- (t-amyloxycarbonyl) -2-pyrrolidinemethanol, Nt-amyloxycarbonyl-4-hydroxy Piperidine, Nt-amyloxycarbonylpyrrolidine, N, N'-di-t-amyloxycarbonyl Perazine,
- Nt-butoxycarbonyldicyclohexylamine Nt-butoxycarbonyl-1-adamantylamine, Nt-butoxycarbonyl-2-adamantylamine, (S)-( ⁇ )-1- (T-butoxycarbonyl) -2-pyrrolidinemethanol, (R)-(+)-1- (t-butoxycarbonyl) -2-pyrrolidinemethanol, Nt-butoxycarbonylpyrrolidine, Nt-butoxycarbonyl-4 -Hydroxypiperidine, Nt-butoxycarbonyl-2-phenylbenzimidazole, Nt-amyloxycarbonyldicyclohexylamine, Nt-amyloxycarbonyl-1-adamantylamine, Nt-amyloxycarbonyl-2- Adamantylamine, (S)-(-)-1- (t- (Miloxycarbonyl) -2-pyrrolidinemethanol, (R)-(+)-1-
- Photodegradable base (C-2):
- the “photodegradable base” is a salt represented by the following general formula (C-2), which acts as a base in the initial structure, but decomposes and loses basicity when irradiated with actinic rays or radiation.
- a compound Such a compound decomposes in the exposed portion and loses acid diffusion controllability, so that the acid is diffused.
- the unexposed portion it acts as a base (that is, an acid diffusion control agent), and thus controls the diffusion of the acid. Therefore, the contrast between the exposed portion and the unexposed portion can be improved, and the LWR characteristics, pattern shape, and pattern collapse resistance of the radiation-sensitive resin composition can be improved.
- X + Z ⁇ (C-2)
- X + represents a sulfonium cation or an iodonium cation.
- a sulfonium cation (c-2-1a) represented by the following general formula (c-2-1a) or an iodonium cation (c-2-1b) represented by the following general formula (c-2-1b) is preferable.
- R 20 and R 21 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, a hydroxyl group or a halogen atom.
- the sulfonium cation (c-2-1a) is an optionally substituted triphenylsulfonium cation
- the iodonium cation (c-2-1b) is an optionally substituted diphenyliodonium cation.
- the sulfonium cation (c-2-1a) is preferably one in which R 20 is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom.
- the iodonium cation (c-2-1b) is one in which R 21 is a hydrogen atom, an alkyl group. , An alkoxy group and a halogen atom are preferred. It is preferable that R 20 and R 21 are these groups in that the effect of reducing the solubility of the polymer (A) in the developer is excellent.
- Z ⁇ is an anion represented by the general formula of R 21 —COO ⁇ , R 21 —SO 3 — or R 21 —N — —SO 2 —R ′ in addition to OH —. .
- R 21 and R ' represents an alkyl group or an aryl group which may be substituted.
- Examples of the optionally substituted alkyl group include an unsubstituted alkyl group, for example, a hydroxymethyl group, a 1-hydroxyethyl group, a 2-hydroxyethyl group, a 1-hydroxypropyl group, a 2-hydroxypropyl group, 3 A hydroxyalkyl group having 1 to 4 carbon atoms such as a hydroxypropyl group, 1-hydroxybutyl group, 2-hydroxybutyl group, 3-hydroxybutyl group, 4-hydroxybutyl group; methoxy group, ethoxy group, n-propoxy group An alkoxyl group having 1 to 4 carbon atoms such as i-propoxy group, n-butoxy group, 2-methylpropoxy group, 1-methylpropoxy group and t-butoxy group; cyano group; cyanomethyl group, 2-cyanoethyl group, 3 -One or more substituents such as cyanoalkyl groups having 2 to 5 carbon atoms such as cyanopropyl group and 4-cyanobuty
- Examples of the optionally substituted aryl group include a phenyl group, a benzyl group, a phenylethyl group, a phenylpropyl group, and a phenylcyclohexyl group. These compounds are substituted with a hydroxyl group, a cyano group, or the like. And the like. Among these, a phenyl group, a benzyl group, and a phenylcyclohexyl group are preferable.
- Z ⁇ is preferably an anion represented by the following formula (C-2-2a), (C-2-2b) or (C-2-2c).
- R 22 is a hydrogen atom, a part or all of the hydrogen atoms are substituted with fluorine atoms, hydroxyl groups, —OR ′′ groups, —OCOR ′′ groups, or —COOR ′′ groups.
- R ′′ is a linear or branched chain having 1 to 10 carbon atoms.
- Monovalent hydrocarbon group or cyclic or cyclic part having 3 to 20 carbon atoms A monovalent hydrocarbon group having the structure.
- Specific examples of the compound having an anion represented by the general formula (C-2-2c) include compounds (i-1) to (i-25) represented by the following formula.
- the compound (C-2) is specifically a sulfonium salt compound or iodonium salt compound that satisfies the above conditions.
- sulfonium salt compounds examples include triphenylsulfonium hydroxide, triphenylsulfonium acetate, triphenylsulfonium salicylate, diphenyl-4-hydroxyphenylsulfonium hydroxide, diphenyl-4-hydroxyphenylsulfonium acetate, diphenyl-4- Examples thereof include hydroxyphenylsulfonium salicylate, triphenylsulfonium 10-camphor sulfonate, 4-tert-butoxyphenyl diphenylsulfonium 10-camphor sulfonate, and the like.
- these sulfonium salt compounds can be used individually by 1 type or in combination of 2 or more types.
- iodonium salt compound examples include bis (4-t-butylphenyl) iodonium hydroxide, bis (4-t-butylphenyl) iodonium acetate, bis (4-t-butylphenyl) iodonium hydroxide, bis (4-t-butylphenyl) iodonium acetate, bis (4-t-butylphenyl) iodonium salicylate, 4-t-butylphenyl-4-hydroxyphenyliodonium hydroxide, 4-t-butylphenyl-4-hydroxy Phenyliodonium acetate, 4-tert-butylphenyl-4-hydroxyphenyliodonium salicylate, bis (4-tert-butylphenyl) iodonium 10-camphorsulfonate, diphenyliodonium 10-camphor Mention may be made of the sulfonate and the like. In addition, these iodonium salt compounds can be
- Examples of the acid diffusion inhibitor (C) other than the base (C-1) and the photodegradable base (C-2) include nitrogen such as tertiary amine compounds, quaternary ammonium hydroxide compounds, and nitrogen-containing heterocyclic compounds.
- the containing compound can be mentioned.
- tertiary amine compound examples include triethylamine, tri-n-propylamine, tri-n-butylamine, tri-n-pentylamine, tri-n-hexylamine, tri-n-heptylamine, tri-n -Tri (cyclo) alkylamines such as octylamine, cyclohexyldimethylamine, dicyclohexylmethylamine, tricyclohexylamine; aniline, N-methylaniline, N, N-dimethylaniline, 2-methylaniline, 3-methylaniline, 4 -Aromatic amines such as methylaniline, 4-nitroaniline, 2,6-dimethylaniline, 2,6-diisopropylaniline; Alkanolamines such as triethanolamine, N, N-di (hydroxyethyl) aniline; N , N, N ′, N′-Tetramethylethyl Diamine, N, N, N ′,
- Examples of the “quaternary ammonium hydroxide compound” include tetra-n-propylammonium hydroxide and tetra-n-butylammonium hydroxide.
- nitrogen-containing heterocyclic compound examples include pyridine, 2-methylpyridine, 4-methylpyridine, 2-ethylpyridine, 4-ethylpyridine, 2-phenylpyridine, 4-phenylpyridine, 2-methyl-4- Pyridines such as phenylpyridine, nicotine, nicotinic acid, nicotinamide, quinoline, 4-hydroxyquinoline, 8-oxyquinoline, acridine; piperazines such as piperazine, 1- (2-hydroxyethyl) piperazine; pyrazine, pyrazole, Pyridazine, quinosaline, purine, pyrrolidine, piperidine, 3-piperidino-1,2-propanediol, morpholine, 4-methylmorpholine, 1,4-dimethylpiperazine, 1,4-diazabicyclo [2.2.2] octane, imidazole 4-methylimidazole, 1 Benzyl-2-methylimidazole, 4-methyl-2-phenyl-methyl
- the acid diffusion inhibitor (C) can be used alone or in combination of two or more.
- the total amount of the acid diffusion inhibitor (C) used is preferably less than 10 parts by mass with respect to 100 parts by mass of the polymer (A) from the viewpoint of ensuring high sensitivity as a resist. More preferably, it is less than 5 parts by mass. When the total amount used exceeds 10 parts by mass, the sensitivity as a resist tends to be remarkably reduced. In addition, if the usage-amount of an acid diffusion inhibitor (C) is less than 0.001 mass part, there exists a possibility that the pattern shape and dimensional fidelity as a resist may fall depending on process conditions.
- Solvent (D) As the solvent (D), at least the polymer (A), the acid generator (B), the acid diffusion inhibitor (C), and a solvent that can dissolve the additive (E) if desired are particularly limited. is not.
- Examples of the solvent (D) include propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol mono-n-propyl ether acetate, propylene glycol mono-i-propyl ether acetate, propylene glycol mono-n-butyl ether acetate.
- Propylene glycol monoalkyl ether acetates such as propylene glycol mono-i-butyl ether acetate, propylene glycol mono-sec-butyl ether acetate, propylene glycol mono-t-butyl ether acetate;
- Cyclic ketones such as cyclopentanone, 3-methylcyclopentanone, cyclohexanone, 2-methylcyclohexanone, 2,6-dimethylcyclohexanone, isophorone; 2-butanone, 2-pentanone, 3-methyl-2-butanone, 2 Ketones such as hexanone, 4-methyl-2-pentanone, 3-methyl-2-pentanone, 3,3-dimethyl-2-butanone, 2-heptanone and 2-octanone; methyl 2-hydroxypropionate, 2- Ethyl hydroxypropionate, n-propyl 2-hydroxypropionate, i-propyl 2-hydroxypropionate, n-butyl 2-hydroxypropionate, i-butyl 2-hydroxypropionate, sec-butyl 2-hydroxypropionate, T-butyl 2-hydroxypropionate, etc.
- n-propyl alcohol i-propyl alcohol, n-butyl alcohol, t-butyl alcohol, cyclohexanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol mono-n-butyl ether , Diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol di-n-propyl ether, diethylene glycol di-n-butyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol mono-n-propyl ether acetate, propylene glycol monomethyl ether , Propylene glycol monoethyl Ether, propylene glycol mono -n- propyl ether,
- propylene glycol monoalkyl ether acetates particularly propylene glycol monomethyl ether acetate.
- ketones, alkyl 2-hydroxypropionate, alkyl 3-alkoxypropionate, ⁇ -butyrolactone and the like are preferable.
- These solvent can be used individually by 1 type or in mixture of 2 or more types.
- Additive (E) In the radiation-sensitive resin composition of the present invention, various additives (E) such as a fluorine-containing polymer, an alicyclic skeleton-containing polymer, a surfactant, and a sensitizer are blended as necessary. Can do. The amount of each additive can be determined as appropriate according to the purpose.
- the fluorine-containing polymer exhibits an action of developing water repellency on the resist film surface particularly in immersion exposure. In addition, it suppresses the elution of components from the resist film to the immersion liquid, and does not leave droplets even if immersion exposure is performed by high-speed scanning, and as a result, suppresses immersion-derived defects such as watermark defects. It is an effective ingredient.
- the structure of the fluorine-containing polymer is not particularly limited.
- Fluorine-containing polymer that is insoluble in the developer and becomes alkali-soluble by the action of acid (2) itself is acceptable in the developer.
- a fluorine-containing polymer which is soluble and increases in alkali solubility by the action of an acid (3) a fluorine-containing polymer which itself is insoluble in a developer and becomes alkali-soluble by the action of an alkali; and (4) itself is developed. Examples thereof include a fluorine-containing polymer that is soluble in a liquid and whose alkali solubility is increased by the action of an alkali.
- fluorine-containing polymer examples include a polymer having at least one repeating unit selected from the repeating unit (a-3) and the fluorine-containing repeating unit. Furthermore, the polymer which has is preferable.
- fluorine-containing repeating unit examples include trifluoromethyl (meth) acrylate, 2,2,2-trifluoroethyl (meth) acrylate, perfluoroethyl (meth) acrylate, and perfluoro n-propyl (meth) acrylate.
- fluorine-containing polymer for example, polymers represented by the following general formulas (E-1a) to (E-1f) are preferable. These fluorine-containing polymers can be used individually by 1 type or in mixture of 2 or more types.
- the alicyclic skeleton-containing polymer is a component having an action of further improving dry etching resistance, pattern shape, adhesion to a substrate, and the like.
- Examples of the alicyclic skeleton-containing polymer include 1-adamantanecarboxylic acid, 2-adamantanone, 1-adamantanecarboxylic acid t-butyl, 1-adamantanecarboxylic acid t-butoxycarbonylmethyl, 1-adamantanecarboxylic acid ⁇ - Butyrolactone ester, 1,3-adamantane dicarboxylic acid di-t-butyl, 1-adamantane acetate t-butyl, 1-adamantane acetate t-butoxycarbonylmethyl, 1,3-adamantane diacetate di-t-butyl, 2,5 Adamantane derivatives such as dimethyl-2,5-di (adamantylcarbonyloxy) hexane;
- Surfactant is a component that exhibits the action of improving coatability, striation, developability, and the like.
- the surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene n-octylphenyl ether, polyoxyethylene n-nonylphenyl ether, polyethylene glycol dilaurate, polyethylene glycol
- nonionic surfactants such as distearate, KP341 (manufactured by Shin-Etsu Chemical Co., Ltd.), Polyflow No. 75, no.
- the sensitizer absorbs radiation energy and transmits the energy to the acid generator (B), thereby increasing the amount of acid produced. It has the effect of improving the “apparent sensitivity”.
- sensitizer examples include carbazoles, acetophenones, benzophenones, naphthalenes, phenols, biacetyl, eosin, rose bengal, pyrenes, anthracenes, phenothiazines and the like. These sensitizers can be used individually by 1 type or in mixture of 2 or more types.
- additives dyes, pigments, adhesion aids and the like can be used.
- the latent image of the exposed area can be visualized, and the influence of halation during exposure can be reduced.
- substrate can be improved by mix
- other additives include alkali-soluble polymers, low-molecular alkali solubility control agents having acid-dissociable protecting groups, antihalation agents, storage stabilizers, antifoaming agents, and the like.
- additive (E) one of the various additives described above may be used alone, or two or more of them may be used in combination.
- Photoresist pattern forming method The radiation sensitive resin composition of the present invention is useful as a chemically amplified resist.
- a polymer component mainly an acid dissociable group in the polymer (A)
- A is dissociated by the action of an acid generated from an acid generator by exposure to generate a carboxyl group.
- the solubility of the exposed portion of the resist in the alkaline developer is increased, and the exposed portion is dissolved and removed by the alkaline developer to obtain a positive photoresist pattern.
- step (1) a step of forming a photoresist film on a substrate using the radiation sensitive resin composition (hereinafter sometimes referred to as “step (1)”). And (2) a step of irradiating the exposed photoresist film with radiation through a mask having a predetermined pattern (if necessary, through an immersion medium) and exposing (hereinafter referred to as “step (2)”). And (3) a step of developing the exposed photoresist film to form a photoresist pattern (hereinafter sometimes referred to as “step (3)”). is there.
- an immersion liquid insoluble immersion protective film is formed on the resist film. It may be provided.
- a solvent-peeling type protective film see, for example, JP-A-2006-227632
- Any of liquid-removable protective films see, for example, WO 2005-069096 and WO 2006-035790
- a resin composition solution obtained by dissolving the resin composition of the present invention in a solvent is applied to a substrate (silicon wafer, dioxide dioxide) by an appropriate application means such as spin coating, cast coating, roll coating or the like.
- a photoresist film is formed by coating on a silicon-coated wafer or the like.
- the solvent in the coating film is volatilized by pre-baking (PB) to form a resist film.
- the thickness of the resist film is not particularly limited, but is preferably 0.1 to 5 ⁇ m, and more preferably 0.1 to 2 ⁇ m.
- the prebaking heating condition varies depending on the composition of the radiation sensitive resin composition, it is preferably 30 to 200 ° C, more preferably 50 to 150 ° C.
- a photoresist pattern using the radiation-sensitive resin composition of the present invention in order to maximize the potential of the radiation-sensitive resin composition, organic or inorganic reflection is performed on the substrate used.
- a preventive film may be formed (see Japanese Patent Publication No. 6-12452).
- a protective film may be provided on the photoresist film in order to prevent the influence of basic impurities and the like contained in the environmental atmosphere (see Japanese Patent Laid-Open No. 5-188598).
- the immersion protective film may be provided on the photoresist film.
- step (2) the photoresist film formed in step (1) is irradiated with radiation (possibly through an immersion medium such as water) and exposed.
- radiation is irradiated through a mask having a predetermined pattern.
- the radiation is appropriately selected from visible light, ultraviolet light, far ultraviolet light, X-rays, charged particle beams and the like according to the type of acid generator.
- Far ultraviolet rays represented by ArF excimer laser (wavelength 193 nm) and KrF excimer laser (wavelength 248 nm) are preferable, and ArF excimer laser is particularly preferable.
- the exposure conditions such as the exposure amount are appropriately set according to the blending composition of the radiation-sensitive resin composition and the kind of additive.
- PEB post-exposure heat treatment
- the heating condition of PEB varies depending on the composition of the radiation sensitive resin composition, but is preferably 30 to 200 ° C, more preferably 50 to 170 ° C.
- step (3) the exposed photoresist film is developed with a developer to form a predetermined photoresist pattern. After development, it is common to wash with water and dry.
- Examples of the developer include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, ethylamine, n-propylamine, diethylamine, di-n-propylamine, triethylamine, methyldiethylamine , Ethyldimethylamine, triethanolamine, tetramethylammonium hydroxide, pyrrole, piperidine, choline, 1,8-diazabicyclo- [5.4.0] -7-undecene, 1,5-diazabicyclo- [4.3. [0]
- An aqueous alkali solution in which at least one alkaline compound such as 5-nonene is dissolved is preferable.
- the concentration of the alkaline aqueous solution is usually 10% by mass or less. If it exceeds 10% by mass, the unexposed area may be dissolved in the developer, which is not preferable.
- the developer may be a solution obtained by adding an organic solvent to an alkaline aqueous solution.
- organic solvent include ketones such as acetone, methyl ethyl ketone, methyl i-butyl ketone, cyclopentanone, cyclohexanone, 3-methylcyclopentanone, and 2,6-dimethylcyclohexanone; methyl alcohol, ethyl alcohol, n-propyl alcohol Alcohols such as i-propyl alcohol, n-butyl alcohol, t-butyl alcohol, cyclopentanol, cyclohexanol, 1,4-hexanediol and 1,4-hexanedimethylol; ethers such as tetrahydrofuran and dioxane; Examples thereof include esters such as ethyl acetate, n-butyl acetate and i-amyl acetate; aromatic hydrocarbons such as toluene
- the amount of the organic solvent used is preferably 100 parts by volume or less with respect to 100 parts by volume of the alkaline aqueous solution. When the amount of the organic solvent exceeds 100 parts by volume, the developability is lowered, and there is a possibility that the development residue in the exposed part increases.
- An appropriate amount of a surfactant or the like may be added to the developer.
- Mw, Mn, and Mw / Mn use GPC columns (trade name “G2000HXL”, product name “G3000HXL”, product name “G4000HXL”, 1 each, manufactured by Tosoh Corporation), flow rate: 1.0 mL / min, Elution solvent: Tetrahydrofuran, Column temperature: It was measured by gel permeation chromatography (GPC) using monodisperse polystyrene as a standard under analysis conditions of 40 ° C. Further, the degree of dispersion “Mw / Mn” was calculated from the measurement results of Mw and Mn.
- GPC gel permeation chromatography
- the low molecular weight component is a component having a monomer as a main component and a molecular weight of less than 1,000 (that is, a trimer molecular weight or less).
- the filtered white powder was slurried with 200 g of methanol and washed twice. Thereafter, the white powder was again filtered off and dried at 50 ° C. for 17 hours to obtain a white powder copolymer (37 g, yield 74%). This copolymer was designated as polymer (A-1).
- This copolymer had Mw of 7321 and Mw / Mn of 1.70, and as a result of 13 C-NMR analysis, the monomer (M-6), monomer (M-12) and monomer The content of each repeating unit derived from the body (M-8) was 45.2: 19.5: 35.3 (mol%). The residual ratio of the low molecular weight component in this copolymer was 0.05% by mass. The measurement results are shown in Table 2.
- Tables 7 and 8 show the compositions of the radiation-sensitive resin compositions prepared in each example and comparative example. Further, each of the radiation-sensitive resin compositions other than the polymers (A-1) to (A-31) and acid diffusion inhibitors (C-9) to (C-11) synthesized in the above synthesis examples. Components (acid generator (B), acid diffusion inhibitor (C) and solvent (D)) are shown below.
- ⁇ Acid generator (B)> (B-1): 4-cyclohexylphenyl, diphenylsulfonium, nonafluoro-n-butanesulfonate, (B-2): Triphenylsulfonium nonafluoro-n-butanesulfonate, (B-3): 1- (4-n-butoxynaphthalen-1-yl) tetrahydrothiophenium nonafluoro-n-butanesulfonate (B-4): 1- (4-n-butoxynaphthalen-1-yl) tetrahydrothiophenium ⁇ 2- (bicyclo [2.2.1] hept-2-yl) -1,1,2,2 -Tetrafluoroethanesulfonate, (B-5): triphenylsulfonium ⁇ 2- (bicyclo [2.2.1] hept-2-yl) -1,1,2,2-tetrafluoroethanesulfonate,
- C-1) Nt-butoxycarbonyl-4-hydroxypiperidine
- C-2) R-(+)-(t-butoxycarbonyl) -2-piperidinemethanol
- C-3) Nt-butoxycarbonylpyrrolidine
- C-4) Nt-butoxycarbonyl-2-phenylbenzimidazole
- C-5) tri-n-octylamine
- C-6) phenyldiethanolamine
- C-7) triphenylsulfonium salicylate
- C-8) Triphenylsulfonium camphorsulfonate.
- Example 1 100 parts by mass of the polymer (A-1) obtained in Synthesis Example 1, 8.4 parts by mass of (B-2) triphenylsulfonium / nonafluoro-n-butanesulfonate as the acid generator (B), acid diffusion suppression
- As the agent (C) 0.9 part by mass of (C-2) R-(+)-(t-butoxycarbonyl) -2-piperidinemethanol was mixed, and (D- 1) 1500 parts by weight of propylene glycol monomethyl ether acetate, 650 parts by weight of (D-2) cyclohexanone and 40 parts by weight of (D-3) ⁇ -butyrolactone were added to dissolve the above mixture to obtain a mixed solution.
- the mixed solution was filtered through a filter having a pore size of 0.20 ⁇ m to prepare a radiation sensitive resin composition.
- Table 3 shows the formulation of the radiation sensitive resin composition.
- Sensitivity (unit: mJ / cm 2 ): A lower antireflection film having a film thickness of 77 nm was formed on an 8-inch wafer surface using a lower antireflection film forming agent (trade name: ARC29A, manufactured by Nissan Chemical Industries, Ltd.).
- the radiation-sensitive resin compositions of Examples and Comparative Examples were applied to the surface of this substrate by spin coating, and subjected to SB (Soft Bake) for 90 seconds at a temperature shown in Table 4 on a hot plate, and the film thickness was 120 nm. A resist film was formed.
- the resist film was exposed through a mask pattern using a full field reduction projection exposure apparatus (trade name: S306C, Nikon Corporation, numerical aperture 0.78). Thereafter, PEB was performed for 90 seconds at the temperature shown in Table 4, and then developed with a 2.38 mass% tetramethylammonium hydroxide aqueous solution (hereinafter referred to as “TMAH aqueous solution”) at 25 ° C. for 60 seconds, followed by washing with water. And dried to form a positive resist pattern.
- TMAH aqueous solution 2.38 mass% tetramethylammonium hydroxide aqueous solution
- the exposure amount (mJ / cm 2 ) formed in a one-to-one line and space with a line width of 90 nm is defined as an optimum exposure amount through a mask with a one-to-one line and space with a dimension of 90 nm.
- the optimum exposure amount (mJ / cm 2 ) was defined as “sensitivity”.
- Isolated space depth of focus (unit: ⁇ m)
- the focus fluctuation width when the 90 nmS / 1150 nmP pattern size resolved with the mask pattern of 115 nmS / 1150 nmP at the optimum exposure dose is within the range of 81 to 99 nmS / 1150 nmP was defined as the isolated line focal depth. Specifically, it was evaluated as “good” when the isolated space focal depth was 0.20 ⁇ m or more, and “bad” when it was less than 0.20 ⁇ m. The scanning electron microscope was used for observing the pattern dimensions.
- LWR unit: nm
- the line width was measured at 10 points at arbitrary points, and the 3 sigma value of the measured value (Variation) was defined as LWR. Specifically, when the LWR was 8.0 nm or less, it was evaluated as “good”, and when it exceeded 8.0 nm, it was evaluated as “bad”.
- MEEF Using the scanning electron microscope, with the optimum exposure dose, five mask sizes (85.0 nmL / 180 nmP, 87.5 nmL / 180 nmP, 90.0 nmL / 180 nmP, 92.5 nmL / 180 nmP, 95.0 nmL / 180 nmP) Resolved pattern dimensions were measured. The measurement results were plotted with the horizontal axis representing the mask size and the vertical axis representing the line width, and the slope of the graph was determined by the least square method. This inclination was defined as MEEF. Specifically, it was evaluated as “good” when the MEEF was 4.0 or more and “bad” when it was less than 4.0.
- Minimum collapse size When observing a 90 nm line-and-space pattern resolved at the optimum exposure amount for sensitivity evaluation, the line width of the resulting pattern is narrow when exposure is performed with an exposure amount larger than the optimum exposure amount. As a result, the resist pattern is finally collapsed.
- the line width at the maximum exposure amount at which the resist pattern was not confirmed to be collapsed was defined as the minimum dimension before collapse (nm), which was used as an index of pattern collapse resistance. Specifically, when the dimension before the minimum collapse was 40.0 nm or less, it was evaluated as “good”, and when it exceeded 40.0 nm, “bad”. In addition, the said scanning electron microscope was used for the measurement of the dimension before minimum collapse.
- a wafer for defect inspection was prepared as follows.
- a lower-layer antireflection film forming agent (trade name: ARC25, manufactured by Brewer Science Co., Ltd.) was coated to a film thickness of 820 mm to produce a wafer substrate.
- the lower-layer antireflection film-forming agent was coated to a film thickness of 770 mm to produce wafer substrates.
- the radiation sensitive resin composition of the Example and the comparative example was apply
- SB SoftBake
- the radiation-sensitive resin composition was applied on the wafer substrate with a film thickness of 0.12 ⁇ m.
- a full field exposure apparatus (trade name: S306C, manufactured by Nikon Corporation), 5 mm ⁇ 5 mm blank exposure was performed to expose the entire wafer surface. After exposure, PEB was performed under conditions of 130 ° C./90 seconds, and then developed with a 2.38 wt% TMAH aqueous solution at 25 ° C. for 30 seconds, washed with water, and dried to prepare a wafer for defect inspection. The above coating, firing and development were all performed inline using a coater / developer (trade name: CLEAN TRACK ACT8, manufactured by Tokyo Electron Ltd.).
- the defect inspection apparatus Using the defect inspection apparatus, the total number of defects of development defects in the exposed portion of the wafer for defect inspection produced by the method was inspected.
- the inspection of the total number of defects was performed by observing in the array mode and detecting the total number of defects of clusters and unclusters extracted from the difference caused by the comparison image and the pixel unit overlap.
- the sensitivity was set so that the defect inspection apparatus could detect defects of 0.15 ⁇ m or more. By this inspection, it was evaluated as “good” when the number of development defects was 30 / wafer or less, and “defect” when it exceeded 30 / wafer.
- Exposure margin was defined as the ratio of the exposure amount range when the pattern dimension resolved by the 90 nm 1L / 1S mask pattern was within ⁇ 10% of the mask design dimension to the optimum exposure amount. Specifically, it was evaluated as “good” when the exposure margin was 10% or more, and “bad” when it was less than 10%. The scanning electron microscope was used for observing the pattern dimensions.
- Pattern cross-sectional shape The cross-sectional shape of the line-and-space pattern with a line width of 90 nm resolved with the above sensitivity is observed with the trade name “S-4200” (manufactured by Hitachi High-Technologies Corporation), and the line width in the middle of the resist pattern Lb and the line width La at the upper part of the film are measured, and the case where it is within the range of 0.9 ⁇ (La / Lb) ⁇ 1.1 is evaluated as “good”, and the case where it is out of range is determined as “bad”. It was evaluated.
- Examples 26 and 27 Comparative Examples 12 and 13
- the radiation-sensitive resin composition Examples 26 and 27
- Examples 26 and 27 was prepared in the same manner as in Example 1 except that the composition of each component for preparing the radiation-sensitive resin composition was changed as shown in Table 11. Comparative Examples 12 and 13) were obtained.
- Sensitivity (unit: mJ / cm 2 ) An 8-inch wafer surface was coated with a lower-layer antireflection film forming agent (trade name: DUV42P, manufactured by Brewer Science) to a film thickness of 60 nm to form a film.
- the radiation sensitive resin compositions of Examples and Comparative Examples were applied to the surface of this substrate by spin coating, and SB was performed for 90 seconds at a temperature shown in Table 12 on a hot plate to form a resist film having a thickness of 335 nm. Formed.
- the resist film was exposed through a mask pattern using a full-field reduction projection exposure apparatus (trade name: PASS 5500/750, manufactured by ASML, numerical aperture 0.70, exposure wavelength 248 nm).
- PEB was performed for 90 seconds at the temperature shown in Table 12, and then developed with a 2.38 mass% TMAH aqueous solution at 25 ° C. for 60 seconds, washed with water, and dried to form a positive resist pattern.
- the exposure amount (mJ / cm 2 ) formed in a one-to-one line-and-space with a line width of 130 nm is defined as an optimum exposure amount through a 130-nm one-to-one line-and-space mask.
- the optimum exposure amount (mJ / cm 2 ) was defined as “sensitivity”.
- the scanning electron microscope was used for length measurement.
- Minimum resolution size The minimum dimension that can be resolved with the optimal exposure dose of the 130 nm 1L / 1S pattern is observed from above the pattern using the scanning electron microscope.
- the minimum line width that can be resolved by this resist is defined as the minimum resolution dimension, which is used as an index of resolution. Specifically, it was evaluated as “good” when the dimension before the minimum collapse was 110 nm or less, and “bad” when it exceeded 110 nm.
- the radiation-sensitive resin composition of the present invention can be suitably used as a lithography material using a KrF excimer laser and an ArF excimer laser as a light source. Moreover, it can respond also to immersion exposure.
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Abstract
Description
本発明における重合体(A)は、前記一般式(a-1)で示される繰り返し単位(a-1)を有する重合体である。
繰り返し単位(a-1)は、前記一般式(a-1)で示される、環状炭酸エステル構造を含む基(前記一般式(a’)で表される基(以下、「基(a’)」ともいう)を有する繰り返し単位であり、重合体(A)の必須繰り返し単位である。
重合体(A)として、前記繰り返し単位(a-1)に加えて、ラクトン構造を含む繰り返し単位(a-2)を有する重合体を含有することが好ましい。
重合体(A)は、繰り返し単位(a-1)に加えて、下記一般式(a-3)で示される繰り返し単位(a-3)を有する重合体であることが好ましい。
次に、重合体(A)の製造方法について説明する。
酸発生剤(B)は、露光により酸を発生する、感放射線性の酸発生剤である。この酸発生剤は、露光により発生した酸によって、感放射線性樹脂組成物に含有される重合体(A)中に存在する酸解離性基を解離させて(保護基を脱離させて)、重合体(A)をアルカリ可溶性とする。そして、その結果、レジスト被膜の露光部がアルカリ現像液に易溶性となり、これによりポジ型のレジストパターンが形成される。
R15CyF2ySO3 - :(b-1)
R15SO3 - :(b-2)
(一般式(b-1),(b-2)中、R15は、水素原子、フッ素原子、炭素数1~12の炭化水素基を示し、yは1~10の整数を示す。)
本発明の感放射線性樹脂組成物は、これまでに説明した重合体(A)及び酸発生剤(B)に加えて、酸拡散抑制剤(C)を更に含有する。この酸拡散抑制剤(C)は、露光により酸発生剤から生じる酸のレジスト被膜中における拡散現象を制御し、非露光領域における好ましくない化学反応を抑制するものである。このような酸拡散抑制剤(C)を配合することにより、得られる感放射線性樹脂組成物の貯蔵安定性が向上し、またレジストとしての解像度が更に向上するとともに、露光から露光後の加熱処理までの引き置き時間(PED)の変動によるレジストパターンの線幅変化を抑えることができ、プロセス安定性に極めて優れた組成物が得られる。
塩基(C-1)は下記一般式(C-1)で示される塩基である。
「光分解性塩基」とは、下記一般式(C-2)で示される塩であり、当初構造では塩基として作用するが、活性光線又は放射線を照射されると分解し、塩基性を消失する化合物である。このような化合物は露光部においては分解して酸拡散制御性を失うため酸を拡散させ、逆に未露光部では塩基(即ち酸拡散制御剤)として作用するため酸の拡散を制御する。従って、露光部と未露光部のコントラストを向上させることができ、感放射線性樹脂組成物のLWR特性、パターン形状、パターン倒れ耐性を向上させることができる。
X+Z- :(C-2)
溶剤(D)としては、少なくとも重合体(A)、酸発生剤(B)及び酸拡散抑制剤(C)、所望により添加剤(E)を溶解可能な溶剤であれば、特に限定されるものではない。
本発明の感放射線性樹脂組成物には、必要に応じて、フッ素含有重合体、脂環式骨格含有重合体、界面活性剤、増感剤等の各種の添加剤(E)を配合することができる。各添加剤の配合量は、その目的に応じて適宜決定することができる。
本発明の感放射線性樹脂組成物は、化学増幅型レジストとして有用である。化学増幅型レジストにおいては、露光により酸発生剤から発生した酸の作用によって、重合体成分、主に、重合体(A)中の酸解離性基が解離して、カルボキシル基を生じる。その結果、レジストの露光部のアルカリ現像液に対する溶解性が高くなり、この露光部がアルカリ現像液によって溶解、除去され、ポジ型のフォトレジストパターンが得られる。
Mw及びMnは、GPCカラム(商品名「G2000HXL」2本、商品名「G3000HXL」1本、商品名「G4000HXL」1本、いずれも東ソー社製)を使用し、流量:1.0mL/分、溶出溶媒:テトラヒドロフラン、カラム温度:40℃の分析条件で、単分散ポリスチレンを標準とするゲルパーミエーションクロマトグラフィ(GPC)により測定した。また、分散度「Mw/Mn」は、Mw及びMnの測定結果より算出した。
それぞれの重合体の13C-NMR分析は、核磁気共鳴装置(商品名:JNM-ECX400、日本電子社製)を使用し、測定した。
ODSカラム(商品名:Inertsil ODS-25μmカラム(4.6mmφ×250mm)、ジーエルサイエンス社製)を使用し、流量:1.0mL/分、溶出溶媒:アクリロニトリル/0.1%リン酸水溶液の分析条件で、高速液体クロマトグラフィー(HPLC)により測定した。なお、低分子量成分は、モノマーを主成分とする、分子量1,000未満(即ち、トリマーの分子量以下)の成分である。
重合体(A-1)~(A-31)は、各合成例において、下記の単量体(M-1)~(M-17)を用いて合成した。単量体(M-12)~(M-15)は繰り返し単位(a-1)に相当する単量体、単量体(M-1),(M-8)は繰り返し単位(a-2)に相当する単量体、単量体(M-2),(M-3),(M-11)は繰り返し単位(a-3a)に相当する単量体、単量体(M-7),(M-10)は繰り返し単位(a-3b)に相当する単量体、単量体(M-5),(M-16),(M-17)は一以上の極性基を有する繰り返し単位に相当する単量体である。
単量体(M-6)26.50g(50モル%)、単量体(M-12)8.42g(20モル%)、単量体(M-8)15.08g(30モル%)を2-ブタノン100gに溶解し、更に開始剤としてジメチル2,2’-アゾビス(2-メチルプロピオネート)1.91g(5モル%)を投入した単量体溶液を準備した。
表1,3,5に示す配合処方とした以外は、合成例1と同様にして重合体(A-2)~(A-31)を合成した。
酸拡散抑制剤(C-9)~(C-11)となる化合物を合成した。これらの化合物は光分解性塩基(C-2)に相当する化合物である。
イオン交換樹脂(商品名:QAE Sephadex A-25、GEヘルスケアバイオサイエンス社製)20gを超純水にて一昼夜膨潤させた後、カラム管に充填した。イオン交換樹脂を充填したカラム管に、式(X-1)で表されるナトリウム塩28gをメタノールに溶解した溶液を流し込み、スルホンアミドアニオンをイオン交換樹脂に担持した。十分量のメタノールにてフラッシュバックした後、トリフェニルスルホニウムクロライド5.2gをメタノールに溶解した溶液をカラム管に流し込み、アニオン交換反応を行った。得られた溶液をエバポレーターにて溶剤留去した後、室温で一昼夜乾燥して、下記式(C-9)で表される光分解性塩基(C-9)を得た(収量8.0g)。
ジフェニルヨードニウムクロライド5.6gをメタノールに溶解した溶液をカラム管に流し込み、アニオン交換反応を行ったことを除いては、合成例32と同様にして下記式(C-10)で表される光分解性塩基(C-10)を得た(収量8.2g)。
前記イオン交換樹脂20gを超純水にて一昼夜膨潤させた後、カラム管に充填した。予め(X-2)誘導体(セントラルガラス社製)を金属塩基(炭酸水素ナトリウム)にて脱プロトン化した下記式(X-2)で表されるナトリウム塩を用意し、前記ナトリウム塩28gをメタノールに溶解した溶液を前記カラム管に流し込み、スルホンアミドアニオンをイオン交換樹脂に担持した。十分量のメタノールにてフラッシュバックした後、トリフェニルスルホニウムクロライド5.2gをメタノールに溶解した溶液をカラム管に流し込み、アニオン交換を行った。得られた溶液をエバポレーターにて溶剤留去した後、室温で一昼夜乾燥して、下記式(C-11)で表される光分解性塩基(C-11)を得た(収量8.1g)。
表7及び表8に、各実施例及び比較例にて調製された感放射線性樹脂組成物の組成を示す。また、上記合成例にて合成した重合体(A-1)~(A-31)及び酸拡散抑制剤(C-9)~(C-11)以外の感放射線性樹脂組成物を構成する各成分(酸発生剤(B)、酸拡散抑制剤(C)及び溶剤(D))について以下に示す。
(B-1):4-シクロヘキシルフェニル・ジフェニルスルホニウム・ノナフルオロ-n-ブタンスルホネート、
(B-2):トリフェニルスルホニウム・ノナフルオロ-n-ブタンスルホネート、
(B-3):1-(4-n-ブトキシナフタレン-1-イル)テトラヒドロチオフェニウム・ノナフルオロ-n-ブタンスルホネート、
(B-4):1-(4-n-ブトキシナフタレン-1-イル)テトラヒドロチオフェニウム・2-(ビシクロ[2.2.1]ヘプタ-2-イル)-1,1,2,2-テトラフルオロエタンスルホネート、
(B-5):トリフェニルスルホニウム・2-(ビシクロ[2.2.1]ヘプタ-2-イル)-1,1,2,2-テトラフルオロエタンスルホネート、
(B-6):トリフェニルスルホニウム・2-(ビシクロ[2.2.1]ヘプタ-2-イル)-1,1-ジフルオロエタンスルホネート。
(C-1):N-t-ブトキシカルボニル-4-ヒドロキシピペリジン、
(C-2):R-(+)-(t-ブトキシカルボニル)-2-ピペリジンメタノール、
(C-3):N-t-ブトキシカルボニルピロリジン、
(C-4):N-t-ブトキシカルボニル-2-フェニルベンズイミダゾール、
(C-5):トリ-n-オクチルアミン、
(C-6):フェニルジエタノールアミン、
(C-7):トリフェニルスルホニウムサリチレート、
(C-8):トリフェニルスルホニウムカンファースルホネート。
(D-1):プロピレングリコールモノメチルエーテルアセテート、
(D-2):シクロヘキサノン、
(D-3):γ-ブチロラクトン。
合成例1で得られた重合体(A-1)100質量部、酸発生剤(B)として、(B-2)トリフェニルスルホニウム・ノナフルオロ-n-ブタンスルホネート8.4質量部、酸拡散抑制剤(C)として、(C-2)R-(+)-(t-ブトキシカルボニル)-2-ピペリジンメタノール0.9質量部を混合し、この混合物に、溶剤(D)として、(D-1)プロピレングリコールモノメチルエーテルアセテート1500質量部、(D-2)シクロヘキサノン650質量部及び(D-3)γ-ブチロラクトン40質量部を添加し、上記混合物を溶解させて混合溶液を得、得られた混合溶液を孔径0.20μmのフィルターでろ過して感放射線性樹脂組成物を調製した。表3に感放射線性樹脂組成物の配合処方を示す。
感放射線性樹脂組成物を調製する各成分の組成を表7及び表8に示すように変更したことを除いては、実施例1と同様にして、感放射線性樹脂組成物(実施例2~25、比較例1~11)を得た。
得られた実施例1~25、比較例1~11の感放射線性樹脂組成物について、ArFエキシマレーザーを光源として、感度、密集ライン焦点深度、孤立スペース焦点深度、LWR、MEEF、最小倒壊前寸法、露光余裕、パターンの断面形状及び現像欠陥数について評価を行った。評価結果を表9及び表10に示す。
8インチのウエハー表面に、下層反射防止膜形成剤(商品名:ARC29A、日産化学社製)を用いて、膜厚77nmの下層反射防止膜を形成した。この基板の表面に、実施例及び比較例の感放射線性樹脂組成物をスピンコートにより塗布し、ホットプレート上にて、表4に示す温度で90秒間SB(SoftBake)を行い、膜厚120nmのレジスト被膜を形成した。
最適露光量にて90nm1L/1Sマスクパターンで解像されるパターン寸法が、マスクの設計寸法の±10%以内となる場合のフォーカスの振れ幅を密集ライン焦点深度とした。具体的には、密集ライン焦点深度が0.40μm以上の場合「良好」、0.40μm未満の場合「不良」と評価した。なお、パターン寸法の観測には前記走査型電子顕微鏡を用いた。
最適露光量にて115nmS/1150nmPのマスクパターンで解像される90nmS/1150nmPパターン寸法が、81~99nmS/1150nmPの範囲内となる場合のフォーカスの振れ幅を孤立ライン焦点深度とした。具体的には、孤立スペース焦点深度が0.20μm以上の場合「良好」、0.20μm未満の場合「不良」と評価した。なお、パターン寸法の観測には前記走査型電子顕微鏡を用いた。
前記走査型電子顕微鏡を用いて、最適露光量にて解像した90nm1L/1Sのパターンをパターン上部から観察する際に、線幅を任意のポイントで10点測定し、その測定値の3シグマ値(ばらつき)をLWRとした。具体的には、LWRが8.0nm以下の場合「良好」、8.0nmを超える場合「不良」と評価した。
前記走査型電子顕微鏡を用い、最適露光量において、5種類のマスクサイズ(85.0nmL/180nmP、87.5nmL/180nmP、90.0nmL/180nmP、92.5nmL/180nmP、95.0nmL/180nmP)で解像されるパターン寸法を測定した。その測定結果を、横軸をマスクサイズ、縦軸を線幅としてプロットし、最小二乗法によりグラフの傾きを求めた。この傾きをMEEFとした。具体的には、MEEFが4.0以上の場合「良好」、4.0未満の場合「不良」と評価した。
上記感度の評価の最適露光量にて解像した90nmのライン・アンド・スペースパターンの観測において、この最適露光量よりも大きな露光量にて露光を行った場合、得られるパターンの線幅が細くなるため、最終的にレジストパターンの倒壊が見られる。このレジストパターンの倒壊が確認されない最大の露光量における線幅を最小倒壊前寸法(nm)と定義し、パターン倒れ耐性の指標とした。具体的には、最小倒壊前寸法が40.0nm以下の場合「良好」、40.0nmを超える場合「不良」と評価した。なお、最小倒壊前寸法の測定は、前記走査型電子顕微鏡を用いた。
現像欠陥数は、欠陥検査装置(商品名:KLA2351、ケー・エル・エー・テンコール社製)を用いる下記方法により評価した。欠陥検査用ウエハーは、次のように作成した。下層反射防止膜形成剤(商品名:ARC25、ブルワー・サイエンス社製)を膜厚820Åとなるようにコートし、ウエハー基板を作製した。但し、実施例22~25については、前記下層反射防止膜形成剤を膜厚770Åとなるようにコートし、ウエハー基板を作製した。この基板上に、実施例及び比較例の感放射線性樹脂組成物を膜厚0.30μmで塗布し、表4に示す温度で90秒間SB(SoftBake)を行った。但し、実施例22~25については、ウエハー基板上に感放射線性樹脂組成物を膜厚0.12μmで塗布した。
90nm1L/1Sマスクパターンで解像されるパターン寸法が、マスクの設計寸法の±10%以内となる場合の露光量の範囲の、最適露光量に対する割合を露光余裕とした。具体的には、露光余裕が10%以上の場合「良好」、10%未満の場合「不良」と評価した。なお、パターン寸法の観測には前記走査型電子顕微鏡を用いた。
上記感度で解像した線幅90nmのライン・アンド・スペースパターンの断面形状を、商品名「S-4200」(株式会社日立ハイテクノロジーズ社製)にて観察し、レジストパターンの中間での線幅Lbと、膜の上部での線幅Laを測り、0.9≦(La/Lb)≦1.1の範囲内である場合を「良好」と評価し、範囲外である場合を「不良」と評価した。
更に、感放射線性樹脂組成物を調製する各成分の組成を表11に示すように変更したことを除いては、実施例1と同様にして、感放射線性樹脂組成物(実施例26,27、比較例12,13)を得た。
得られた実施例26,27、比較例12,13の感放射線性樹脂組成物について、KrFエキシマレーザーを光源として、感度、密集ライン焦点深度、及び最小倒壊前寸法について評価を行った。評価結果を表12に示す。
8インチウエハー表面に、下層反射防止膜形成剤(商品名:DUV42P、ブルワー・サイエンス社製)を膜厚60nmとなるようにコートし、膜形成した。この基板の表面に、実施例及び比較例の感放射線性樹脂組成物をスピンコートにより塗布し、ホットプレート上にて、表12に示す温度で90秒間SBを行い、膜厚335nmのレジスト被膜を形成した。このレジスト被膜に、フルフィールド縮小投影露光装置(商品名:PASS5500/750、ASML社製、開口数0.70、露光波長248nm)を用い、マスクパターンを介して露光した。
最適露光量にて130nm1L/1Sマスクパターンで解像されるパターン寸法が、マスクの設計寸法の±10%以内となる場合のフォーカスの振れ幅を密集ライン焦点深度とした。なお、パターン寸法の観測には前記走査型電子顕微鏡を用いた。具体的には、密集ライン焦点深度が0.70μm以上の場合「良好」、0.70μm未満の場合「不良」と評価した。
130nm1L/1Sパターンの最適露光量にて解像可能な最小寸法を、前記走査型電子顕微鏡を用いてパターン上部から観察する。このレジストが解像可能な最小の線幅を最小解像寸法と定義し、解像性の指標とした。具体的には、最小倒壊前寸法が110nm以下の場合「良好」、110nmを超える場合「不良」と評価した。
Claims (5)
- 酸解離性基を有する重合体(A)と、感放射線性の酸発生剤(B)と、酸拡散抑制剤(C)と、を含有し、
前記重合体(A)として、下記一般式(a-1)で示される繰り返し単位(a-1)を有する重合体を含有し、
前記酸拡散抑制剤(C)として、下記一般式(C-1)で示される塩基(C-1)及び光分解性塩基(C-2)のうちの少なくとも一種の塩基を含有する感放射線性樹脂組成物。
- 前記重合体(A)として、前記炭酸エステル環の前記第1の結合を有する第1の炭素原子とは異なる第2の炭素原子が前記第2の結合を有し、前記第1の炭素原子及び前記第2の炭素原子を構成原子とする縮合環が形成された繰り返し単位、及び前記炭酸エステル環の前記第1の結合を有する第1の炭素原子が前記第2の結合をも有し、前記第1の炭素原子をスピロ原子とするスピロ環が形成された繰り返し単位のうちの少なくとも一種の繰り返し単位、を有する重合体を含有する請求項1に記載の感放射線性樹脂組成物。
- 前記重合体(A)として、前記繰り返し単位(a-1)に加えて、ラクトン構造を含む繰り返し単位(a-2)を有する重合体を含有する請求項1に記載の感放射線性樹脂組成物。
- 下記一般式(a-1)で示される繰り返し単位(a-1)と、下記一般式(a-3a)で示される繰り返し単位(a-3a)及び下記一般式(a―3b)で示される繰り返し単位(a-3b)のうちの少なくとも1種の繰り返し単位と、を有する重合体。
- 前記繰り返し単位(a-1)と、前記繰り返し単位(a-3a)とを有する、請求項4に記載の重合体。
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CN2009801354994A CN102150082B (zh) | 2008-09-10 | 2009-09-10 | 放射线敏感性树脂组合物 |
EP09813111.3A EP2325695B1 (en) | 2008-09-10 | 2009-09-10 | Radiation-sensitive resin composition |
KR1020117005620A KR101733251B1 (ko) | 2008-09-10 | 2009-09-10 | 감방사선성 수지 조성물 |
US13/044,573 US20110223537A1 (en) | 2008-09-10 | 2011-03-10 | Radiation-sensitive resin composition and polymer |
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JP2009002730A JP5287264B2 (ja) | 2009-01-08 | 2009-01-08 | 感放射線性樹脂組成物 |
JP2009-002797 | 2009-01-08 | ||
JP2009002797A JP2010160348A (ja) | 2009-01-08 | 2009-01-08 | 感放射線性樹脂組成物及び重合体 |
JP2009-002730 | 2009-01-08 |
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EP (1) | EP2325695B1 (ja) |
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JP2013145256A (ja) * | 2012-01-13 | 2013-07-25 | Shin Etsu Chem Co Ltd | パターン形成方法及びレジスト材料 |
JP2014071305A (ja) * | 2012-09-28 | 2014-04-21 | Fujifilm Corp | 感活性光線性又は感放射線性組成物、並びに、それを用いたレジスト膜、マスクブランクス、及びレジストパターン形成方法 |
WO2014185279A1 (ja) * | 2013-05-13 | 2014-11-20 | 株式会社ダイセル | カルバミン酸エステル化合物とこれを含むレジスト製造用溶剤組成物 |
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TWI533082B (zh) | 2016-05-11 |
KR20110052704A (ko) | 2011-05-18 |
EP2325695A4 (en) | 2012-04-04 |
TW201017332A (en) | 2010-05-01 |
EP2325695A1 (en) | 2011-05-25 |
CN102150082B (zh) | 2013-08-07 |
CN102150082A (zh) | 2011-08-10 |
EP2325695B1 (en) | 2017-12-20 |
KR101733251B1 (ko) | 2017-05-08 |
US20110223537A1 (en) | 2011-09-15 |
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